Security In Information Systems Eduardo Fernández-Medina, Julio César Hernández Castro and Luis Javier García Villalba (Eds.) Proceedings of the 2nd International Workshop on Security In Information Systems, WOSIS 2004 In conjunction with ICEIS 2004 Porto, Portugal, April 2004 WOSIS 2004 INSTICC INSTICC INSTICC INSTICC INSTICC Press Press Press Press Press